I'm incapable of properly sneezing ?

I have this thing where whenever I have the urge to sneeze, I can't let it out, I always sneeze inwards, from another person's view I would just jerk my head foreward and close my eyes tight and that's it, no sound at all. This is how it's been my entire life, and people think it's weird as ****, and nobody has ever heard of somebody else doing the same thing. People say I should just stop holding my sneezes in, but I don't know how to do that.

I'm not particularily concerned with this, it's just very strange, I hope there are at least a handful of others just like me in this regard.